| abstract |
The invention concerns a process and a composition for the determination of ions in fluids, wherein the influence of these ions on the activity of an enzyme is measured and wherein the affinity of the enzyme to the ion to be determined or the affinity of an enyzme to interfering ions needs to be decreased. The enzymes which are used may be, for example, a transferase, a hydrolase, an oxidoreductase or a lyase. |